package com.libc.yygh.cmn.service.imp;

import com.alibaba.excel.EasyExcel;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.libc.yygh.cmn.listener.DictListener;
import com.libc.yygh.cmn.mapper.DictMapper;
import com.libc.yygh.cmn.service.DictService;
import com.libc.yygh.model.cmn.Dict;
import com.libc.yygh.vo.cmn.DictEeVo;
import org.springframework.beans.BeanUtils;
import org.springframework.cache.annotation.CacheEvict;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

/**
 * *
 * Created with Description:
 *
 * @fileRelativePath: DictServiceImpl.java
 * @Date: Created on 2022/6/6  0:09  <br>
 * @author: LiBencheng <br>
 * @version: 1.0 <br>
 */
@Service
public class DictServiceImpl extends ServiceImpl< DictMapper,Dict > implements DictService
{

    //根据数据id查询子数据列表
    @Override                        
    //@Cacheable(value = "dict",keyGenerator = "keyGenerator")
    public List< Dict > findChlidData(Long id)
    {
        QueryWrapper< Dict > wrapper = new QueryWrapper<>();
        wrapper.eq("parent_id", id);
        List< Dict > dictList = baseMapper.selectList(wrapper);
        //向list集合每个dict对象中设置hasChildren
        for (Dict dict : dictList)
        {
            Long dictId = dict.getId();
            boolean isChild = this.isChildren(dictId);
            dict.setHasChildren(isChild);
        }
        return dictList;
    }

    //导出数据字典接口
    @Override
    public void exportDictData(HttpServletResponse response)
    {
        //设置下载信息
        response.setContentType("application/vnd.ms-excel");
        response.setCharacterEncoding("utf-8");
        String fileName = "dict";
        response.setHeader("Content-disposition", "attachment;filename=" + fileName + ".xlsx");
        //查询数据库
        List< Dict > dictList = baseMapper.selectList(null);
        //Dict -- DictEeVo
        List< DictEeVo > dictVoList = new ArrayList<>();
        for (Dict dict : dictList)
        {
            DictEeVo dictEeVo = new DictEeVo();
            // dictEeVo.setId(dict.getId());
            BeanUtils.copyProperties(dict, dictEeVo);
            dictVoList.add(dictEeVo);
        }
        //调用方法进行写操作
        try
        {
            EasyExcel.write(response.getOutputStream(), DictEeVo.class).sheet("dict")
                     .doWrite(dictVoList);
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
    }

    //导入数据字典
    @Override
    @CacheEvict (value = "dict", allEntries = true)
    public void importDictData(MultipartFile file)
    {
        try
        {
            EasyExcel.read(file.getInputStream(), DictEeVo.class, new DictListener(baseMapper)).sheet().doRead();
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
    }

    //根据dictcode和value查询
    @Override
    public String getDictName(String dictCode, String value)
    {
        //如果dictCode为空，直接根据value查询
        if (StringUtils.isEmpty(dictCode))
        {
            //直接根据value查询
            QueryWrapper< Dict > wrapper = new QueryWrapper<>();
            wrapper.eq("value", value);
            Dict dict = baseMapper.selectOne(wrapper);
            return dict.getName();
        }
        else
        {//如果dictCode不为空，根据dictCode和value查询
            //根据dictcode查询dict对象，得到dict的id值
            Dict codeDict = this.getDictByDictCode(dictCode);
            Long parent_id = codeDict.getId();
            //根据parent_id和value进行查询
            Dict finalDict = baseMapper.selectOne(new QueryWrapper< Dict >()
                                                          .eq("parent_id", parent_id)
                                                          .eq("value", value));
            return finalDict.getName();
        }
    }

    //根据dictCode获取下级节点
    @Override
    public List< Dict > findByDictCode(String dictCode)
    {
        //根据dictcode获取对应id
        Dict dict = this.getDictByDictCode(dictCode);
        //根据id获取子节点
        List< Dict > chlidData = this.findChlidData(dict.getId());
        return chlidData;
    }

    private Dict getDictByDictCode(String dictCode)
    {
        QueryWrapper< Dict > wrapper = new QueryWrapper<>();
        wrapper.eq("dict_code", dictCode);
        Dict codeDict = baseMapper.selectOne(wrapper);
        return codeDict;
    }

    //判断id下面是否有子节点
    private boolean isChildren(Long id)
    {
        QueryWrapper< Dict > wrapper = new QueryWrapper<>();
        wrapper.eq("parent_id", id);
        Integer count = Math.toIntExact(baseMapper.selectCount(wrapper));
        // 0>0    1>0
        return count > 0;
    }
}
